AD7899ARZ-1

Overview

The AD7899ARZ-1 is a 14-bit, 400 kSPS successive-approximation analog-to-digital converter operating from a single 5 V supply. It features an internal 2.5 V reference and supports input ranges of ±5 V and ±10 V. The device includes a track/hold amplifier with 0.3 µs acquisition time and offers overvoltage protection on analog inputs. Digital interfaces support both 3 V and 5 V logic levels via the VDRIVE pin. Power consumption is typically 80 mW in normal mode and drops to 20 µW in standby.

Feature Summary

• Integrated high-speed parallel interface compatible with 3 V and 5 V processors
• On-chip laser-trimmed clock oscillator or external clock selection for conversion timing
• Overvoltage protection allows analog inputs to exceed supply limits without damage
• Configurable bipolar input ranges including ±5 V and ±10 V options

Applications

• Industrial process control systems requiring isolated signal acquisition
• Data acquisition modules for multi-channel sensing applications
• Portable instrumentation powered by single-supply batteries
• Medical equipment requiring precise low-power signal digitization

Procurement Notes

Verify the suffix 'RZ' indicates RoHS compliance and lead-free packaging when sourcing this component. Confirm the specific temperature grade 'A' corresponds to the commercial range of -40°C to +85°C as defined in the ordering guide. Ensure the package type matches the required board layout, typically SOIC-28 for this variant. Cross-reference the manufacturer's current datasheet revision to confirm pinout consistency before finalizing procurement orders.

Selection Notes

Select the AD7899ARZ-1 specifically for applications requiring bipolar input ranges of ±5 V or ±10 V. This version uses two's complement output coding suitable for signed data processing. Consider the AD7899ARZ-2 if unipolar 0 V to 5 V operation is needed instead. Evaluate power constraints against the typical 80 mW dissipation rate. Ensure the system clock requirements align with the internal oscillator or external CLKIN capabilities for optimal throughput performance.

Part Context

The AD7899 series comprises three variants differentiated by analog input voltage ranges. The AD7899-1 handles standard industrial bipolar signals, while the -2 and -3 versions offer unipolar and narrower bipolar ranges respectively. All variants share identical digital interfaces, power specifications, and core ADC architecture. The ARZ designation signifies the commercial temperature grade and environmentally compliant packaging within the broader AD7899 product family.

Replacement Considerations

No direct public substitute part numbers are documented in the official Analog Devices datasheet for this specific model. Designers should evaluate other 14-bit SAR ADCs from the manufacturer's portfolio if pin compatibility is not required. Verify that any alternative component meets the same 400 kSPS throughput and input range specifications.